CVE-2026-47783

Publication date 20 May 2026

Last updated 27 May 2026

Ubuntu priority

Cvss 3 Severity Score

Description

In memcached before 1.6.42, username data for SASL password database authentication has a timing side channel because a loop exits as soon as a valid username is found by sasl_server_userdb_checkpass.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
memcached	26.04 LTS resolute	Fixed 1.6.40-1ubuntu0.1
	25.10 questing	Fixed 1.6.38-1ubuntu0.1
	24.04 LTS noble	Fixed 1.6.24-1ubuntu0.1
	22.04 LTS jammy	Fixed 1.6.14-1ubuntu0.2
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
memcached	Upstream: d13f282

Severity score breakdown

Parameter	Value
Base score	8.1 · High
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-8320-1
Memcached vulnerabilities
27 May 2026